Snap-On™ Pipe Marker for pipes 1 1/2" to 2 3/8" OD, and provides 360° visibility. Pipe Marker meets the requirements of the ASME (ANSI) A13.1 Standard for the identification of piping system contents. The Snap-on pipe marker is made of lightweight and durable coiled plastic and is ideal for indoor or outdoor environments. Pipe marker can be effortlessly applied to dirty, oily, greasy or even rough pipes. It is just as easily removed and can be reapplied in other areas, making it ideal in either a current facility or new construction.